Fix distroless image build. (#69)

Author: Gerrit91

Dockerfile

@@ -1,10 +1,10 @@
 # Build the firewall-controller-manager binary
-FROM golang:1.23 as builder
+FROM golang:1.23 AS builder
 
 WORKDIR /work
 COPY . .
 RUN make
 
 FROM gcr.io/distroless/static-debian12:nonroot
-COPY --from=builder /work/bin/firewall-controller-manager .
+COPY --from=builder /work/bin/firewall-controller-manager /firewall-controller-manager
 ENTRYPOINT ["/firewall-controller-manager"]